model 336: setting and querying the control loops

There are several commands that provide configuration and status information for the heater outputs on the Model 336

HTR? X produces the output percentage of the output X (X=1 or 2) maximum power or current as set in the OUTMODE Configuration
HTRSET X Is the heater setup command
HTRST? X reports the error status of the heater
OUTMODE X is how to configure the output (X= 1 to 4)
RANGE X is where you set the output range
SETP X is where you enter the setpoint value
RAMP X is where you set the setpoint ramp value

All of the commands can be reviewed in section 6.6.1 of the Model 336 User Manual